CA2013122A1 - Monoaxially stretch shaped article of polytetrafluoroethylene and process for producing the same - Google Patents
Monoaxially stretch shaped article of polytetrafluoroethylene and process for producing the sameInfo
- Publication number
- CA2013122A1 CA2013122A1 CA002013122A CA2013122A CA2013122A1 CA 2013122 A1 CA2013122 A1 CA 2013122A1 CA 002013122 A CA002013122 A CA 002013122A CA 2013122 A CA2013122 A CA 2013122A CA 2013122 A1 CA2013122 A1 CA 2013122A1
- Authority
- CA
- Canada
- Prior art keywords
- stretched
- shaped article
- shaped body
- heated
- set forth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/08—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of halogenated hydrocarbons
- D01F6/12—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of halogenated hydrocarbons from polymers of fluorinated hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Artificial Filaments (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Laminated Bodies (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- External Artificial Organs (AREA)
- Noodles (AREA)
- Materials For Medical Uses (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
To produce a monoaxially stretched shaped article of polytetrafluoroethylene (PTFE), a pasty mass containing PTFE powder is continuously shaped to a shaped body, which is fed over a plurality of rollers or rolls, heated and stretched. The shaped body is heated to a temperature of between 327 and 450°C prior to stretching strain, it is sintered simultaneously and is then stretched. This process allows for the production of a monoaxially stretched shaped article of PTFE which has strength values in the stretching direction of at least 500 N/mm2 and a density of between 1.80 and 2.30 g/cm3.
To produce a monoaxially stretched shaped article of polytetrafluoroethylene (PTFE), a pasty mass containing PTFE powder is continuously shaped to a shaped body, which is fed over a plurality of rollers or rolls, heated and stretched. The shaped body is heated to a temperature of between 327 and 450°C prior to stretching strain, it is sintered simultaneously and is then stretched. This process allows for the production of a monoaxially stretched shaped article of PTFE which has strength values in the stretching direction of at least 500 N/mm2 and a density of between 1.80 and 2.30 g/cm3.
Description
2~ 3~
The invention relates to a monoaxially stretched article of polytetrafluoroethylene (PTFE) as well as to a process for its production.
Because of its thermal stability and its chemical inertness, PTFE is an appreciated material. However, there are some fields in which its use is limited, since one has not yet succeeded in producing a shaped article of PTFE
which exhibits a high mechanical strength and at the same time a high density.
If such a material were processed to weaving yarns, for instance, it would be possible to manufacture particularly long-wearing fabrics of PTFE. The combination of excellent strength and high density also would be advantageous for wrapping electric conductors, the dielectric breakdown strength increasing along with the density.
At present, PTFE shaped articles having strengths up to 250 N/mm2 are commercially available, yet their densities lie below 1 g/cm3. These shaped articles are produced by stretching unsintered PTFE. On the other hand, the sintered PTFE shaped bodies known today have densities of about 2 g/cm3, but strengths of no more than about 50 N/mm2 .
From AT-B 370 674 monoaxially stretched films of sintered PTFE are known, whose strengths in the stretching direction range between 50 N/mm2 and 140 N/mm2. These films are produced by pressing PTFE powder to a cylindrical shaped article at first. After this, the shaped article is sintered, whereupon the films are peeled off, heated to temperatures of at least 327C and stretched.
1.J
GB-A 2 025 835 describes the production of porous PTFE shaped articles according to the paste extrusion method, wherein a pasty mass substantially containing PTFE
powder and a lubricant is pressed through spinnerets, after which the lubricant is removed by drying. Thereafter, the shaped article is heated to above the crystallite melting point of PTFE (327C) and stretched during heating. The strength of the shaped article obtained is the higher the larger the stretching ratio. However, the density of the shaped article decreases accordingly such that, for instance, at a stretch by 550 %, the strength rises to approximately 42 N/mm2, while the density drops to about 0.4 g/cm3.
It is the object of the invention to provide a shaped article of PTFE which does not have the disadvantages pointed out above and exhibits both a high mechanical strength and a high density.
The PTFE shaped article according to the invention is monoaxially stretched, having strength values in the stretching direction of at least 500 N/mm2, preferably of at least 700 N/mm2, and a density of between 1.80 and 2.30 g/cm3, preferably of between 2.00 and 2.20 g/cm3, which shaped article preferably is designed as a film, tape, weaving yarn or sewing yarn. At the strength values indicated, yarns exhibit elongation rates of between 3 %
and 50 %.
The monoaxially stretched PTFE shaped article according to the invention can be produced by continuously forming a pasty mass containing PTFE powder to a shaped body, feeding the shaped body over a plurality of rollers or rolls, 2~ ~3~
heating and stretching the shaped body, wherein the shaped body is heated to a temperature of between 327 and 450C, preferably of between 350 and 390C, prior to stretching, being thus sintered and is then stretched.
An advantageous embodiment of this process according to the invention consists in that the shaped body is stretched between a roll or pair of rolls heated to a temperature of between 327 and 450C, preferably of between 350 and 390C, and an unheated take off unit.
It has proved useful to stretch at a ratio of between 1 :
5 and 1 : 30, preferably of between 1 : 10 and 1 : 20. When stretching at a ratio of 1 : 30, a strength of apæroximately 1150 N/mm2 is obtained.
An embodiment of the process according to the invention will be explained in more detail by way of the drawing.
At first, PTFE powder, in a manner known per se, is mixed with a lubricant, stored for several hours at a temperature of between 20 and 50C, and pressed to a shaped body at pressures ranging between 10 and 50 bar. This shaped body, also in a manner known per se, is then extruded to a rod through a single-hole spinneret and rolled to a film, which is freed from lubricant by drying.
This dried film is then continuously fed to the sintering and stretching plant schematically illustrated in the drawing. It consists essentially of a feeding means 1, two heated rolls 3', 3" and an unheated take off uni~ 4, the arrows in the drawing symbolizing the direction of rotation of the heated rolls 3', 3" and the pull off direction of the film.
The film transferred to the feeding means 1 is Z~3~
continuously guided over the heated rolls 3', 3" and sintered thereon. In doing so, the film preferably is wrapped around the rolls like an "S" in order to get heating from both sides. The rolls have been heated to a temperature of at least 327C. Immediately after the sintering process, the film is stretched. The film is pulled off by the unheated take off unit 4, which, as illustrated in the drawing, comprises several reels.
Finally, the stretched material is wound on suitable bobbin aggregates.
To produce tapes, the dried film advantageously is cut by means of a cutting bar already when passing the feeding organ 1.
The invention will be explained in even more detail by way of the following examples.
Exa_~le 1:
100 parts of PTFE emulsion powder and 23 parts of petrol (boiling range 186 to 214C) were pressed to a cylindrical rod, calendered to a film having a thickness of 0.1 mm and dried. Then the film was supplied to the feeding means 1, cut into strips of 6 mm width, guided over rolls 3', 3" heated to 380C whilst being sintered, and stretched at a ratio of 1 : 15 by these rolls. The tape obtained had a strength of 835 N/mm at an elongation of 5.6 ~ and a density of 2.12 g/cm3. The initial thickness was reduced to 0.0236 mm, the width to 1.4 mm.
The PTFE tapes obtained could be processed to a weaving yarn (twisted or untwisted) and to a sewing yarn (double twisted).
2~
Exa_~le 2_ PTFE pressed to a rod as in Example 1 was rolled to a film of 0.114 mm thickness and dried. This film was guided over rolls 3', 3" heated to 375C, at a width of 230 mm and simultaneously sintered. Immediately upon sintering it was stretched at a ratio of 1 : 15. The strength of the film obtained was 692 N/mm2 at an elongation of 7.5 % and a density of 2.17 g/cm3. The dielectric breakdown strength was 190 kV/mm. The film had a width of 46.6 mm and a thickness of 0.024 mm.
The film was free of pores, exhibited good sliding characteristics and excellent electric insulating properties and is excellently suited to wrap electric conductors.
Example 3:
PTFE pressed to a rod as in Example 1 was rolled to a film of 0.05 mm thickness and dried. The film was cut into strips having a width of 25 mm, guided over rolls 3', 3"
heated to 385C and simultaneously sintered. Subsequently, stretched at a ratio of 1 : 15, thus a strength of 703 N/mm2 at an elongation of 5.6 % and a density of 1.93 g/cm3, was obtained.The width was 5.8 mm and thethickness was 0.013 mm.
The invention relates to a monoaxially stretched article of polytetrafluoroethylene (PTFE) as well as to a process for its production.
Because of its thermal stability and its chemical inertness, PTFE is an appreciated material. However, there are some fields in which its use is limited, since one has not yet succeeded in producing a shaped article of PTFE
which exhibits a high mechanical strength and at the same time a high density.
If such a material were processed to weaving yarns, for instance, it would be possible to manufacture particularly long-wearing fabrics of PTFE. The combination of excellent strength and high density also would be advantageous for wrapping electric conductors, the dielectric breakdown strength increasing along with the density.
At present, PTFE shaped articles having strengths up to 250 N/mm2 are commercially available, yet their densities lie below 1 g/cm3. These shaped articles are produced by stretching unsintered PTFE. On the other hand, the sintered PTFE shaped bodies known today have densities of about 2 g/cm3, but strengths of no more than about 50 N/mm2 .
From AT-B 370 674 monoaxially stretched films of sintered PTFE are known, whose strengths in the stretching direction range between 50 N/mm2 and 140 N/mm2. These films are produced by pressing PTFE powder to a cylindrical shaped article at first. After this, the shaped article is sintered, whereupon the films are peeled off, heated to temperatures of at least 327C and stretched.
1.J
GB-A 2 025 835 describes the production of porous PTFE shaped articles according to the paste extrusion method, wherein a pasty mass substantially containing PTFE
powder and a lubricant is pressed through spinnerets, after which the lubricant is removed by drying. Thereafter, the shaped article is heated to above the crystallite melting point of PTFE (327C) and stretched during heating. The strength of the shaped article obtained is the higher the larger the stretching ratio. However, the density of the shaped article decreases accordingly such that, for instance, at a stretch by 550 %, the strength rises to approximately 42 N/mm2, while the density drops to about 0.4 g/cm3.
It is the object of the invention to provide a shaped article of PTFE which does not have the disadvantages pointed out above and exhibits both a high mechanical strength and a high density.
The PTFE shaped article according to the invention is monoaxially stretched, having strength values in the stretching direction of at least 500 N/mm2, preferably of at least 700 N/mm2, and a density of between 1.80 and 2.30 g/cm3, preferably of between 2.00 and 2.20 g/cm3, which shaped article preferably is designed as a film, tape, weaving yarn or sewing yarn. At the strength values indicated, yarns exhibit elongation rates of between 3 %
and 50 %.
The monoaxially stretched PTFE shaped article according to the invention can be produced by continuously forming a pasty mass containing PTFE powder to a shaped body, feeding the shaped body over a plurality of rollers or rolls, 2~ ~3~
heating and stretching the shaped body, wherein the shaped body is heated to a temperature of between 327 and 450C, preferably of between 350 and 390C, prior to stretching, being thus sintered and is then stretched.
An advantageous embodiment of this process according to the invention consists in that the shaped body is stretched between a roll or pair of rolls heated to a temperature of between 327 and 450C, preferably of between 350 and 390C, and an unheated take off unit.
It has proved useful to stretch at a ratio of between 1 :
5 and 1 : 30, preferably of between 1 : 10 and 1 : 20. When stretching at a ratio of 1 : 30, a strength of apæroximately 1150 N/mm2 is obtained.
An embodiment of the process according to the invention will be explained in more detail by way of the drawing.
At first, PTFE powder, in a manner known per se, is mixed with a lubricant, stored for several hours at a temperature of between 20 and 50C, and pressed to a shaped body at pressures ranging between 10 and 50 bar. This shaped body, also in a manner known per se, is then extruded to a rod through a single-hole spinneret and rolled to a film, which is freed from lubricant by drying.
This dried film is then continuously fed to the sintering and stretching plant schematically illustrated in the drawing. It consists essentially of a feeding means 1, two heated rolls 3', 3" and an unheated take off uni~ 4, the arrows in the drawing symbolizing the direction of rotation of the heated rolls 3', 3" and the pull off direction of the film.
The film transferred to the feeding means 1 is Z~3~
continuously guided over the heated rolls 3', 3" and sintered thereon. In doing so, the film preferably is wrapped around the rolls like an "S" in order to get heating from both sides. The rolls have been heated to a temperature of at least 327C. Immediately after the sintering process, the film is stretched. The film is pulled off by the unheated take off unit 4, which, as illustrated in the drawing, comprises several reels.
Finally, the stretched material is wound on suitable bobbin aggregates.
To produce tapes, the dried film advantageously is cut by means of a cutting bar already when passing the feeding organ 1.
The invention will be explained in even more detail by way of the following examples.
Exa_~le 1:
100 parts of PTFE emulsion powder and 23 parts of petrol (boiling range 186 to 214C) were pressed to a cylindrical rod, calendered to a film having a thickness of 0.1 mm and dried. Then the film was supplied to the feeding means 1, cut into strips of 6 mm width, guided over rolls 3', 3" heated to 380C whilst being sintered, and stretched at a ratio of 1 : 15 by these rolls. The tape obtained had a strength of 835 N/mm at an elongation of 5.6 ~ and a density of 2.12 g/cm3. The initial thickness was reduced to 0.0236 mm, the width to 1.4 mm.
The PTFE tapes obtained could be processed to a weaving yarn (twisted or untwisted) and to a sewing yarn (double twisted).
2~
Exa_~le 2_ PTFE pressed to a rod as in Example 1 was rolled to a film of 0.114 mm thickness and dried. This film was guided over rolls 3', 3" heated to 375C, at a width of 230 mm and simultaneously sintered. Immediately upon sintering it was stretched at a ratio of 1 : 15. The strength of the film obtained was 692 N/mm2 at an elongation of 7.5 % and a density of 2.17 g/cm3. The dielectric breakdown strength was 190 kV/mm. The film had a width of 46.6 mm and a thickness of 0.024 mm.
The film was free of pores, exhibited good sliding characteristics and excellent electric insulating properties and is excellently suited to wrap electric conductors.
Example 3:
PTFE pressed to a rod as in Example 1 was rolled to a film of 0.05 mm thickness and dried. The film was cut into strips having a width of 25 mm, guided over rolls 3', 3"
heated to 385C and simultaneously sintered. Subsequently, stretched at a ratio of 1 : 15, thus a strength of 703 N/mm2 at an elongation of 5.6 % and a density of 1.93 g/cm3, was obtained.The width was 5.8 mm and thethickness was 0.013 mm.
Claims (10)
1. A monoaxially stretched shaped article consisting essentially of polytetrafluoroethylene (PTFE), which shaped article is characterized by strength values in the stretching direction of at least 500 N/mm2 and a density of between 1.80 and 2.30 g/cm3.
2. A monoaxially stretched shaped article as set forth in claim 1, wherein said strength values amount to least 700 N/mm2.
3. A monoaxially stretched shaped article as set forth in claim 1, wherein said density ranges between 2.00 and 2.20 g/cm3.
4. A monoaxially stretched shaped article as set forth in claim 1, wherein said shaped article is designed as a film, tape, weaving yarn or sewing yarn.
5. A process for the production of a monoaxially stretched shaped article consisting essentially of polytetrafluoroethylene (PTFE) and having strength values in the stretching direction of at least 500 N/mm2 and a density of between 1.80 and 2.30 g/cm3, which process comprises providing a pasty mass containing PTFE powder, continuously forming said pasty mass to a shaped body, guiding said shaped body over a plurality of rollers or rolls, and heating and stretching said shaped body, wherein the improvement comprises that said shaped body is heated to a temperature of between 327 and 450°C prior to stretching that it is sintered simultaneously and is then stretched.
6. A process as set forth in claim 5, wherein said shaped body is heated to between 350 and 390°C.
7. A process as set forth in claim S to be performed in an arrangement comprising a heated roll or pairs of rollers and an unheated take off unit, wherein said shaped body is stretched between said roll or pairs of rollers heated to a temperature of between 327 and 450°C and said unheated take off unit.
8. A process as set forth in claim 7, wherein at least one of said rolls is heated to between 350 and 390°C.
9. A process as set forth in claim 5, wherein said shaped body is stretched at a ratio of between 1 : 5 and 1 : 30.
10. A process as set forth in claim 5, wherein said shaped body is stretched at a ratio of between 1 : 10 and 1 : 20.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA813/89 | 1989-04-06 | ||
AT0081389A AT391473B (en) | 1989-04-06 | 1989-04-06 | MONOAXIAL STRETCHED MOLDED BODY MADE OF POLYTETRAFLUORETHYLENE AND METHOD FOR THE PRODUCTION THEREOF |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2013122A1 true CA2013122A1 (en) | 1990-10-06 |
Family
ID=3500319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002013122A Abandoned CA2013122A1 (en) | 1989-04-06 | 1990-03-27 | Monoaxially stretch shaped article of polytetrafluoroethylene and process for producing the same |
Country Status (20)
Country | Link |
---|---|
US (1) | US5167890A (en) |
EP (1) | EP0391887B1 (en) |
JP (1) | JP2913062B2 (en) |
KR (1) | KR0178032B1 (en) |
CN (1) | CN1028160C (en) |
AT (2) | AT391473B (en) |
AU (1) | AU639912B2 (en) |
BR (1) | BR9001696A (en) |
CA (1) | CA2013122A1 (en) |
DD (1) | DD293305A5 (en) |
DE (1) | DE59009267D1 (en) |
ES (1) | ES2075192T3 (en) |
FI (1) | FI98349C (en) |
HU (1) | HU212430B (en) |
IE (1) | IE62562B1 (en) |
IL (1) | IL93836A (en) |
RU (1) | RU1839674C (en) |
UA (1) | UA11068A (en) |
YU (1) | YU67490A (en) |
ZA (1) | ZA902390B (en) |
Families Citing this family (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994019170A1 (en) * | 1993-02-18 | 1994-09-01 | W.L. Gore & Associates, Inc. | Macroscopically perforated porous polytetrafluoroethylene materials |
WO1994023098A1 (en) * | 1993-04-05 | 1994-10-13 | Daikin Industries, Ltd. | Polytetrafluoroethylene fiber, cottony material containing the same, and process for producing the same |
AT401271B (en) * | 1993-07-08 | 1996-07-25 | Chemiefaser Lenzing Ag | METHOD FOR PRODUCING CELLULOSE FIBERS |
AT399507B (en) * | 1993-07-30 | 1995-05-26 | Chemiefaser Lenzing Ag | BICOMPONENT MOLDED BODIES MADE OF POLYTETRAFLUORETHYLENE (PTFE) AND METHOD FOR THE PRODUCTION THEREOF |
AT399882B (en) * | 1993-11-03 | 1995-08-25 | Chemiefaser Lenzing Ag | MONOAXIAL STRETCHED MOLDED BODIES MADE OF POLYTETRAFLUORETHYLENE AND METHOD FOR THE PRODUCTION THEREOF |
JP3077534B2 (en) * | 1994-05-31 | 2000-08-14 | 日立電線株式会社 | High strength fiber of polytetrafluoroethylene and method for producing the same |
US5591526A (en) * | 1994-06-15 | 1997-01-07 | W. L. Gore & Associates, Inc | Expanded PTFE fiber and fabric and method of making same |
US6133165A (en) * | 1994-06-30 | 2000-10-17 | Daikin Industries, Ltd. | Bulky polytetrafluoroethylene filament and split yarn, method of producting thereof, method of producing cotton-like materials by using said filament or split yarn and filter cloth for dust collection |
GB9419859D0 (en) * | 1994-10-03 | 1994-11-16 | Westone Prod Ltd | Method and apparatus for forming elongate PTFE material and PTFE material particularly dental floss |
US6863686B2 (en) * | 1995-04-17 | 2005-03-08 | Donald Shannon | Radially expandable tape-reinforced vascular grafts |
US5641373A (en) * | 1995-04-17 | 1997-06-24 | Baxter International Inc. | Method of manufacturing a radially-enlargeable PTFE tape-reinforced vascular graft |
US5552100A (en) * | 1995-05-02 | 1996-09-03 | Baxter International Inc. | Method for manufacturing porous fluoropolymer films |
US5776343A (en) * | 1995-08-03 | 1998-07-07 | Applied Extrusion Technologies, Inc. | Fluoroplastic apertured film fabric, structures employing same and method of making same |
US5814405A (en) * | 1995-08-04 | 1998-09-29 | W. L. Gore & Associates, Inc. | Strong, air permeable membranes of polytetrafluoroethylene |
US6099791A (en) * | 1996-03-08 | 2000-08-08 | Baxter International Inc. | Methods of manufacture of multiaxially oriented fluoropolymer films |
AT408766B (en) | 1996-10-11 | 2002-03-25 | Chemiefaser Lenzing Ag | LOW-FIBRILLATION SHAPED BODY |
JPH10323890A (en) * | 1997-05-23 | 1998-12-08 | Nippon Oil Co Ltd | Manufacture of fluororesin drawing molded product |
US6103172A (en) * | 1998-04-07 | 2000-08-15 | Pall Corporation | Method of preparaing a porous polytetrafluoroethylene membranne |
US5989709A (en) * | 1998-04-30 | 1999-11-23 | Gore Enterprises Holdings, Inc. | Polytetrafluoroethylene fiber |
JP4659241B2 (en) * | 2001-03-19 | 2011-03-30 | ジャパンゴアテックス株式会社 | Polytetrafluoroethylene membrane and method for producing the same |
US6613203B1 (en) | 2001-09-10 | 2003-09-02 | Gore Enterprise Holdings | Ion conducting membrane having high hardness and dimensional stability |
KR100467349B1 (en) * | 2001-10-11 | 2005-01-24 | 김영한 | Preparing method of thin film having high shringkage ratio and apparatus thereof |
US6949287B2 (en) * | 2003-01-20 | 2005-09-27 | Yeu Ming Tai Chemical Industrial Co., Ltd. | Polytetrafluoroethylene fiber and method for manufacturing the same |
US20050238872A1 (en) * | 2004-04-23 | 2005-10-27 | Kennedy Michael E | Fluoropolymer barrier material |
AT503708B1 (en) * | 2005-11-09 | 2009-03-15 | Lenzing Plastics Gmbh | FIBRILLATIONARM FORM BODY |
CN1966784B (en) * | 2005-12-05 | 2010-08-04 | 常州市兴诚高分子材料有限公司 | Device for preparing brown polytetrafluoroethylene fibre |
US8765255B2 (en) * | 2007-03-06 | 2014-07-01 | E I Du Pont De Nemours And Company | Breathable waterproof garment |
US7993523B2 (en) * | 2007-03-06 | 2011-08-09 | E. I. Du Pont De Nemours And Company | Liquid filtration media |
US8038013B2 (en) * | 2007-03-06 | 2011-10-18 | E.I. Du Pont De Nemours And Company | Liquid filtration media |
DE102007032156A1 (en) | 2007-07-03 | 2008-10-23 | Aesculap Ag | Textile vascular prosthesis |
US20090195951A1 (en) * | 2008-02-05 | 2009-08-06 | Bart Sorgeloos | Method and Apparatus for Improved Electrostatic Discharge Protection |
US20100139224A1 (en) * | 2008-12-05 | 2010-06-10 | E. I. Du Pont De Nemours And Company | Filter media with nanoweb layer |
RU2581871C2 (en) | 2011-01-28 | 2016-04-20 | Мерит Медикал Системз, Инк. | Electrospun ptfe coated stent and method of use |
EP2804637B1 (en) | 2012-01-16 | 2019-09-25 | Merit Medical Systems, Inc. | Rotational spun material covered medical appliances and methods of manufacture |
US11541154B2 (en) | 2012-09-19 | 2023-01-03 | Merit Medical Systems, Inc. | Electrospun material covered medical appliances and methods of manufacture |
US9827703B2 (en) | 2013-03-13 | 2017-11-28 | Merit Medical Systems, Inc. | Methods, systems, and apparatuses for manufacturing rotational spun appliances |
WO2014159710A1 (en) * | 2013-03-13 | 2014-10-02 | Merit Medical Systems, Inc. | Serially deposited fiber materials and associated devices and methods |
JP6313450B2 (en) | 2013-08-29 | 2018-04-18 | テレフレックス メディカル インコーポレイテッド | High strength multi-component suture |
CN103770351A (en) * | 2014-02-25 | 2014-05-07 | 韩玉新 | Polytetrafluoroethylene film strip processing technology |
CN105887215A (en) * | 2014-10-31 | 2016-08-24 | 陈路 | Process for manufacturing PTFE sewing thread through extrusion method |
CN105648556A (en) * | 2014-10-31 | 2016-06-08 | 陈路 | Drawing machine making PTFE sewing thread |
CN105887221A (en) * | 2014-10-31 | 2016-08-24 | 陈路 | Multi-roller drafting device for manufacturing PTFE sewing thread |
CN105887225A (en) * | 2014-10-31 | 2016-08-24 | 陈路 | Film splitting drafting device used for manufacturing PTFE sewing thread |
WO2016126591A1 (en) | 2015-02-02 | 2016-08-11 | E. I. Du Pont De Nemours And Company | Root intrusion improvements in irrigation tubes |
EP3261589B1 (en) | 2015-02-26 | 2020-09-16 | Merit Medical Systems, Inc. | Layered medical appliances |
CN108728978B (en) * | 2018-05-05 | 2021-07-30 | 灵氟隆新材料科技江苏有限公司 | Preparation method of fluorescent polytetrafluoroethylene sewing thread |
CN109203525A (en) * | 2018-08-29 | 2019-01-15 | 山东东岳高分子材料有限公司 | A kind of manufacturing process of high-strength polytetrafluoroethyl-ne film |
JP6590350B1 (en) * | 2018-11-15 | 2019-10-16 | 有限会社ヤマカツラボ | Unbaked polytetrafluoroethylene film and method for producing porous film thereof |
CN110528131B (en) * | 2019-09-20 | 2021-07-23 | 常州华福环境科技股份有限公司 | Manufacturing process of high-strength low-friction polytetrafluoroethylene sewing thread |
CN110629303B (en) * | 2019-09-20 | 2021-07-20 | 常州华福环境科技股份有限公司 | Manufacturing process of high-strength low-elongation polytetrafluoroethylene ultra-fine filaments |
CN114770992A (en) * | 2022-04-22 | 2022-07-22 | 睿得新材料科技(佛山)有限公司 | Preparation method of polytetrafluoroethylene stretching belt, stretching belt and preparation device |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA962021A (en) * | 1970-05-21 | 1975-02-04 | Robert W. Gore | Porous products and process therefor |
US4064214A (en) * | 1975-09-22 | 1977-12-20 | E. I. Du Pont De Nemours And Company | Process for making polytetrafluoroethylene yarn |
JPS5355380A (en) * | 1976-10-30 | 1978-05-19 | Nitto Electric Ind Co | Method of producing polytetraluoroethylene film |
GB2025835B (en) * | 1978-05-31 | 1982-10-27 | Nitto Electric Ind Co | Producing a porous polytetrafluorethylene article |
AT370674B (en) * | 1981-09-24 | 1983-04-25 | Chemiefaser Lenzing Ag | METHOD FOR PRODUCING MONOAXIAL STRETCHED FILMS FROM POLYTETRAFLUORAETHYLENE |
US4671754A (en) * | 1984-03-28 | 1987-06-09 | Sumitomo Electric Industries, Ltd. | Apparatus for manufacturing porous polytetrafluoroethylene material |
JPS6116840A (en) * | 1984-07-04 | 1986-01-24 | Nippon Valqua Ind Ltd | Manufacture of porous film of polytetrafluoroethylene |
JPS61293830A (en) * | 1985-06-21 | 1986-12-24 | Nippon Valqua Ind Ltd | Manufacture of polytetrafluoroethylene porous film |
US4820787A (en) * | 1986-03-18 | 1989-04-11 | Asahi Kasei Kogyo Kabushiki Kaisha | Shaped article of an oriented tetrafluoroethylene polymer |
JPH01192812A (en) * | 1988-01-20 | 1989-08-02 | Toray Ind Inc | High-tenacity fiber excellent in heat and chemical resistance and production thereof |
-
1989
- 1989-04-06 AT AT0081389A patent/AT391473B/en active
-
1990
- 1990-03-21 IL IL93836A patent/IL93836A/en not_active IP Right Cessation
- 1990-03-26 US US07/499,033 patent/US5167890A/en not_active Expired - Lifetime
- 1990-03-26 IE IE109990A patent/IE62562B1/en not_active IP Right Cessation
- 1990-03-27 CA CA002013122A patent/CA2013122A1/en not_active Abandoned
- 1990-03-28 ZA ZA902390A patent/ZA902390B/en unknown
- 1990-03-29 AU AU52402/90A patent/AU639912B2/en not_active Ceased
- 1990-03-29 HU HU901892A patent/HU212430B/en not_active IP Right Cessation
- 1990-04-03 JP JP2090061A patent/JP2913062B2/en not_active Expired - Lifetime
- 1990-04-03 EP EP90890096A patent/EP0391887B1/en not_active Expired - Lifetime
- 1990-04-03 ES ES90890096T patent/ES2075192T3/en not_active Expired - Lifetime
- 1990-04-03 FI FI901689A patent/FI98349C/en not_active IP Right Cessation
- 1990-04-03 DE DE59009267T patent/DE59009267D1/en not_active Expired - Lifetime
- 1990-04-03 AT AT90890096T patent/ATE123993T1/en not_active IP Right Cessation
- 1990-04-04 BR BR909001696A patent/BR9001696A/en not_active IP Right Cessation
- 1990-04-05 RU SU904743609A patent/RU1839674C/en active
- 1990-04-05 DD DD90339483A patent/DD293305A5/en not_active IP Right Cessation
- 1990-04-05 UA UA4743609A patent/UA11068A/en unknown
- 1990-04-05 YU YU00674/90A patent/YU67490A/en unknown
- 1990-04-06 CN CN90101999A patent/CN1028160C/en not_active Expired - Lifetime
- 1990-04-06 KR KR1019900004702A patent/KR0178032B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
JP2913062B2 (en) | 1999-06-28 |
EP0391887A2 (en) | 1990-10-10 |
HU901892D0 (en) | 1990-07-28 |
AT391473B (en) | 1990-10-10 |
US5167890A (en) | 1992-12-01 |
FI901689A0 (en) | 1990-04-03 |
AU5240290A (en) | 1990-10-11 |
IE901099L (en) | 1990-10-06 |
RU1839674C (en) | 1993-12-30 |
KR0178032B1 (en) | 1999-05-15 |
EP0391887A3 (en) | 1992-03-18 |
EP0391887B1 (en) | 1995-06-21 |
ATE123993T1 (en) | 1995-07-15 |
UA11068A (en) | 1996-12-25 |
CN1046119A (en) | 1990-10-17 |
ATA81389A (en) | 1990-04-15 |
ES2075192T3 (en) | 1995-10-01 |
FI98349C (en) | 1997-06-10 |
CN1028160C (en) | 1995-04-12 |
DD293305A5 (en) | 1991-08-29 |
IL93836A0 (en) | 1990-12-23 |
DE59009267D1 (en) | 1995-07-27 |
HUT62232A (en) | 1993-04-28 |
HU212430B (en) | 1996-06-28 |
IL93836A (en) | 1993-04-04 |
ZA902390B (en) | 1990-12-28 |
BR9001696A (en) | 1991-05-14 |
AU639912B2 (en) | 1993-08-12 |
JPH02286220A (en) | 1990-11-26 |
KR900016326A (en) | 1990-11-13 |
YU67490A (en) | 1991-10-31 |
IE62562B1 (en) | 1995-02-08 |
FI98349B (en) | 1997-02-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5167890A (en) | Monoaxially stretched shaped article of polytetrafluoroethylene and process for producing the same | |
JP4350095B2 (en) | Method for producing porous fluoropolymer film | |
US5364699A (en) | Continuous polytetrafloroethylene fibers | |
DE1779150C2 (en) | Process for the production of monoaxially stretched film strips | |
US6949287B2 (en) | Polytetrafluoroethylene fiber and method for manufacturing the same | |
EP1574603B1 (en) | Polytetrafluoroethylene fiber and method for manufacturing the same | |
US5698300A (en) | Moulded article made of polytetrafluoroethylene | |
CA1064211A (en) | Process for producing polytetrafluoroethylene products | |
US2918784A (en) | Twisting film strips to yarn | |
CA1316312C (en) | Fluoropolymer working | |
US20050221084A1 (en) | Polytetrafluoroethylene fiber and method for manufacturing the same | |
US3233023A (en) | Spinning of polypropylene | |
US5024797A (en) | Processes for the production of mono- and multifilaments and staple fibers based on polyarylene sulfides | |
EP0118541B1 (en) | Manufacture of low density sintered polytetrafluoroethylene insulated cable | |
DE2002850A1 (en) | Process for the continuous production of fibers and device for carrying out the process | |
Bayer et al. | Tensile properties of an extruded polyethylene-melt | |
US2335191A (en) | Covered product and the process for producing it | |
JP3108644B2 (en) | Method for producing fluororesin fiber sheet | |
JPH0261122A (en) | Production of drawn polyester tape yarn | |
SI9010674A (en) | Monoaxial extended ribbon made from polytetrafluorethylen | |
DE1769784B2 (en) | METHOD FOR MANUFACTURING ELECTRICALLY CONDUCTIVE CARBON FIBER MATERIAL |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
FZDE | Discontinued |